Mitsubishi Electric FR-A720-0.4K Instruction Manual page 403

Operation Panel
Indication
Name
Output side earth (ground) fault overcurrent
This function stops the inverter output if an earth (ground) fault overcurrent flows due to an earth
Description
(ground) fault that occurred on the inverter's output (load) side.
Check point Check for an earth (ground) fault in the motor and connection cable.
Corrective action
Remedy the earth (ground) fault portion.
Operation Panel
Indication
Name
Output phase failure
This function stops the inverter output if one of the three phases (U, V, W) on the inverter's output side
Description
(load side) opens.
· Check the wiring (Check that the motor is normal.)
Check point
· Check that the capacity of the motor used is not smaller than that of the inverter.
· Wire the cables properly.
Corrective action
· Check the Pr. 251 Output phase failure protection selection setting.
Operation Panel
Indication
Name
External thermal relay operation
If the external thermal relay provided for motor overheat protection, or the internally mounted
Description
temperature relay in the motor, etc. switches on (contacts open), the inverter output is stopped.
· Check for motor overheating.
Check point
· Check that the value of 7 (OH signal) is set correctly in any of Pr. 178 to Pr. 189 (input terminal function selection).
· Reduce the load and operating duty.
Corrective action
· Even if the relay contacts are reset automatically, the inverter will not restart unless it is reset.
*2 Functions only when any of Pr. 178 to Pr. 189 (input terminal function selection) is set to OH.
Operation Panel
Indication
Name PTC thermistor operation
Appears when the motor overheat status is detected for 10s or more by the external PTC thermistor
Description
input connected to the terminal AU.
· Check the connection between the PTC thermistor switch and thermal protector.
Check point · Check the motor for operation under overload.
· Is valid setting ( = 63) selected in Pr. 184 AU terminal function selection ? (Refer to page 178, 221.)
Corrective action
Reduce the load weight.
Operation Panel
Indication
Name Option alarm
Appears when the AC power supply is connected to the terminal R/L1, S/L2, T/L3 accidentally when a
high power factor converter is connected.
Description
Appears when torque command by the plug-in option is selected using Pr. 804 Torque command source
selection and no plug-in option is mounted.
Appears when the switch for the manufacturer setting of the plug-in option is changed.
· Check that the AC power supply is not connected to the terminal R/L1, S/L2, T/L3 when a high power
Check point
· Check that the plug-in option for torque command setting is connected.
· Check the parameter (Pr. 30) setting and wiring.
· The inverter may be damaged if the AC power supply is connected to the terminal R/L1, S/L2, T/L3
Corrective action
· Check for connection of the plug-in option. Check the Pr. 804 Torque command source selection setting.
· Return the switch for the manufacturer setting of the plug-in option to the initial status. (Refer to
Operation Panel
Indication
Name Communication option alarm
Description
Stops the inverter output when a communication line error occurs in the communication option.
· Check for a wrong option function setting and operation.
· Check that the plug-in option is plugged into the connector securely.
Check point
· Check for a brake in the communication cable.
· Check that the terminating resistor is fitted properly.
· Check the option function setting, etc.
Corrective action · Connect the plug-in option securely.
· Check the connection of communication cable.
E.GF
E.LF
E.OHT
E.PTC
E.OPT
factor converter (FR-HC, MT-HC) or power regeneration common converter (FR-CV) is connected.
when a high power factor converter is connected. Please contact your sales representative.
instruction manual of each option)
E.OP3
Causes and corrective actions
FR-PU04
Ground Fault
FR-PU07
FR-PU04

FR-PU07
FR-PU04
OH Fault
FR-PU07
*2
FR-PU04 Fault 14
FR-PU07 PTC activated
FR-PU04
Option Fault
FR-PU07
FR-PU04
Option slot alarm 3
FR-PU07
5
393